As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2312 - EWR-SAV - FLIGHT CREW DIVERTED FLIGHT TO RIC DUE TO MAIN BATTERY NR 2 OVERTEMP INDICATION. CREW LANDED IN RIC UNEVENTFULLY. RIC MX REMOVED AND REPLACED NR 2 MAIN BATTERY AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.